The light-cone formalism has been widely recognized as a convenient way to calculate the parton distribution functions of nucleon and meson [1]}.
Within the light-cone approach, the wave functions for a hadronic composite state can be expressed as LCWFs in Fock-state basis.
On the other hand, the overlap representation has also been used to study various form factors of the hadrons [2]} and the pion [3]}, anomalous magnetic moment of the nucleon [2]} as well as generalized parton distribution functions [5]}. recently, the has also applied to calculate the T-odd TMDs  [6]}, [7]}
In this section, we will extend the light-cone formalism to calculate the Sivers function of sea quarks.
